This aim of this dissertation is to provide a first (partial) account for a wide range of syntactic constructions in Italian Sign Language (LIS) and Sign Language of the Netherlands (NGT) within an antisymmetric
framework. On the one hand, it tries to evaluate the attested crosslinguistic variation between these two languages; on the other hand, it assesses whether the observed differences can be derived from a strict specifier-head-complement deep structure where only leftward movement occurs.